洋葱、玉米、芸豆3种作物轮作种植既可以充分利用土壤各种营养,又可以防止病虫害发生。由于种植茬口充分衔接,每667m2土地年收入达4000元以上。1.洋葱栽培技术(1)防止洋葱抽薹。①掌握播种期。播种期一般要根据地力和气候条件而定,土壤肥沃,秧苗容易长大,就要比土质瘠薄的迟播, Onion, corn, kidney beans crop rotation planting three crops can not only make full use of nutrients, but also can prevent pests and diseases. Due to the full convergence of stubble planting, the annual income of 667m2 land reaches more than 4,000 yuan. 1. Onion cultivation techniques (1) to prevent the onion bolting. ① master sowing period. Sowing time generally based on the conditions of the soil and climatic conditions, fertile soil, easy to grow seedlings, it is infertile than late infertility soil,